Glassware forming machine



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Patented Oct. 9, 1934 PATENT OFFICE 1,916,299 v GLAsswAnE roaMrNG MACHINE Edward H. Lorenz and George E. Rowe, West Hartford, Conn., assignors to Hartford-Empire Company, Hartford, Conn., a corporation of Delaware Application october 31, 1939, serial No. 492,407

4s claims. (Cl. 411-5) This invention relates to glassware forming machines and has particular relation to such machines which comprise two horizontal mold tables supported for rotation about spaced vertical axes, upon one 4of which tables parison forming or parison mold units are mounted, and the other of which carries finishing or blow mold units.

More specifically, the invention is concerned with a glassware forming machine of the above character in which the parison forming units may be inverted for the reception of mold charges, which may be supplied thereto by the well known suspended charge feeding method, and for settle blowing the charges in the parison forming units, after which the units may be reverted and the charges counterblown therein, to form parisons in neck-up position. The parisons may then be transferred to the blow mold units on the blow mold table wherein they are blown to final shape.

Heretofore, two-table glassware forming machines generally have been operated interrnittently, necessarily entailing a comparatively low speed at which the glassware is made therein. 'I'he usefulness of two-table glassware forming machines previously proposed also has been limited by the character of the feeding and shaping cycle of operation, resulting further in a low rate of production of finished ware as well as lack of attainment of a desirably high standard of quality in the ware. Thus, in such prior machines, limited efficiency of operation has been enforced by exof operation, whereby different stages or phases of the glass forming cycle may be varied as is desirable, if not necessary, for emcient and rapid manufacture of glassware of high quality, espec? ially glassware 'varying greatly in size and/or shape.

In order to overcome the foregoing limitations more or less inherent in the two-table forming machines heretofore proposed, it is the general object of the present invention to provide a twotable machine of the general character above referred to which maybe continuously operated,

which is well adapted for carrying out the overlapping cycle method of forming glassware, such as bottles and other hollow ware, and which is so constructed and arranged as to provide for variations in the individual steps of the method, and for flexibility of operation in general.

A more specific object of the invention is to provide a novel glassware forming machine of the kind in which the parison forming units are inverted for the supply of charges of glass thereto and are afterwards reverted, and embodying means of novel construction for effecting the inversion and reversion of the said units.

A further object of the invention is to provide a novel glassware forming machine of the char-- acter in which charges of glass are supplied from a suitable feeder to continuously rotating parison mold units when said units are inverted, and comprising novel mechanism for directing such charges from the feeder into the molds while the molds are traveling.

It also is an object of the invention to provide a machine having continuously rotating parison mold units, each of the units comprising a neck mold and a parison body mold, 'and having mechanism of novel character associated therewith for operating the molds.

Another object of the invention is to provide mechanism of novel character in a machine of the kind referred to, for operating neck pins which are associated with the parison mold units.

A still further object of the invention is to provide a machine of the character in which charges of glass are settle blown in parison mold units to compact the charges therein, and are afterwards counterblown to expand the charges and form parisons in the units, and comprising novel and improved mechanisms for performing the settle blowing and counterblowing operations.

It also is an object of the invention to provide in a machine for forming glassware, finishing or blow molds and operating mechanisms therefor of novel construction.

Another object of the invention isv to provide means of novel character in a continuous twotable machine, for automatically transferring parisons from continuously moving parison forming units on the one table, to companion, continuously moving, blow mold units on the other table.

In the operation of certain prior two-table forming machines, each of the body molds of the `parison forming units on one table is completely opened when thel shaping of a parison therein is finished, leaving the parison supported by the neck ring for transfer to one of the blow mold units on the other table, after which transfer, nish blowing air is applied to the parison to blow it to final form. During the period between the opening of the body mold and the beginning of the nish blowing, the parison reheats, that is, the temperature conditions in the parison tend to equalize.

A further object of this invention is to provide I'means of novel construction in a two-table forming machine for partially opening or cracking lthe body molds of the parison forming units on theone table prior to the complete opening thereof for the transfer of the parisons to the blow mold units on the other table. As-a result of the provision of such means, a material part of the reheating of the parisons is eiiected while they are held out of contact with the body molds but while enclosed thereby, the molds preventing 'the circulation of air in contact with the parisons and reilecting heat into contact therewith, thereby greatly increasing the eiciency of the reheating operation.

A still further object of the invention is to provide mechanism of novel character for operating blow heads adapted to supply nish blowing air Ito the blow molds of a glass forming machine;

The invention contemplates other improvements of novel character in a glassware forming machine which are not specically enumerated here, but which will become apparent from the 'following description of an illustrated embodiment of the invention.

In order that the invention may more readily 'be understood and its manifold advantages apfthe invention is depicted.

In said drawings:

Figure 1 is a view in side elevation of a continuous two-table glassware forming machine embodying the invention, parts being omitted for fclarity;

Fig. 2 is a view principally in top plan, but 'partially in horizontal section of the construction Ashown in Fig. 1, portions of the structure shown in Fig. 1 being omitted to show parts of the apparatus otherwise concealed;

Fig. 3 is an enlarged View in horizontal section of the parison mold table supporting structure, Said view being taken substantially on the line 3 3 of Fig. 1;

Fig. 4 is a view in longitudinal vertical section of a portion of the parison mold table shown in Figs. 1 and 2, certain mechanisms carried by said table being omitted for clarity, and said view being taken substantially on the line 4 4 of Fig. 2;

Fig. 5 is an enlarged view in vertical vtransverse section showing a portion of the driving mechanism for the machine, said view being taken substantially on the line 5-5 of Fig. 2;

Fig. 6 is a view in horizontal sectional top plan of the construction shown in Fig. 5 and taken on the line 6-6 of said Fig. 5;

Fig. 'lis a partially diagrammatic view in top plan, showing in detail the construction and arrangement of the mold feed or funnel operating mechanism;

Fig. 8 is an enlarged View in rear elevation of a portion of the construction shown in Fig. 2, illustrating in detail driving mechanism for operating the funnel feed device and the settle blow head;

Fig. 9 is a view in vertical transverse section of the construction shown in Fig. 8 and taken substantially on the line 9-9 of Fig. 8;

Fig. l0 is a view in transverse horizontal section taken on the line 10-10 of Fig. 9;

Fig. 11 is a view in transverse Vertical section of a detent for cooperating with the funnel feed mechanism, said view being taken substantially on the line 11-11 of Fig. 7;

Fig. 12 is a detail view in top plan of a portion of the settle blow head operating mechanism, part of which also appears in Fig. '7;

Fig. 13 is an enlarged view in top plan of a single parison forming unit in inverted position;

Fig. 14 is a view similar to Fig. 13, but partially broken away, and showing the parison forming unit in reverted position; l

Fig. 15 is an enlarged detail view in vertical section taken substantially on the line 15--15 of Fig. 14 and showing means for adjusting the neck mold operating cam roller;

Fig. 16 is a view in horizontal section taken on the line 16-16 of Fig. l5;

Fig. 17 is a view in vertical section of the parison forming unit shown in Fig. 14, taken on the line 17-17 of Fig. 14, and showing part of the counterblow baille plate mechanism in side elevation;

Fig. 18 is a View partly in front elevation and partly in vertical longitudinal section of a fragmentary portion of the construction shown in Fig. 1, the sectional portion of said view being taken substantially on the line 18-18 of Fig. 3;

Fig. 19 is a view in elevation looking from the left toward the upper part of the structure shown in Fig. 17, and showing parts of neck pin and counterblow valve operating means, also shown in Fig. 17;

Fig. 20 is a view in transverse vertical section taken on the line 20-20 of Fig. 17 and showing the counterblow valve and operating means therefor;

Fig. 21 is an enlarged detail view in elevation of a valve for controlling the passage of air to and from pneumatic parison body mold operating means;

Fig. 22 is an enlarged view principally in vertical radial section of the settle blow head operating mechanism and settlevblow head, and of a fragmentary portion of a parison forming unit, and showing the parts in the positions which they assume when the settle blow head is traveling in engagement with the bottom of the moving parison body mold of said unit;

Fig. 23 is an enlarged view partially in front elevation and partially in vertical section of part of the settle blowl head operating mechanism shown in Fig. 22 looking from the right of said Fig. 22;

Fig. 24'is an enlarged view in vertical transverse section of a valve member of the settle blow head mechanism shown inA Fig. 23;

Fig. 25 is an enlarged view in perspective of the Valve member shown in Fig. 24;

Fig. 26 is an enlarged View in perspective of a f spring seat associated with the Valve member shown in Figs. 23 and 24;

Fig. 27 is a view in longitudinal vertical section of the blow mold table and supporting structure therefor, parts being omitted for clearness of illustration, and said view being taken substantially on the line 27-27 of Fig. 2;

Fig. 27a is a diagram illustrating the transfer of a parison from a parison forming unit to a blow mold unit;

Fig. 28 is a view in horizontal sectional top plan of the supporting structure for the blow mold table and showing the arrangement of valves for controlling the application of blowing air to the blow molds, said view being taken substantially on the line 28--28 of Fig. 1;

Fig. 29 is an enlarged view in top plan of a blow mold unit including both the blow mold and a blow head therefor, and associated mechanisms;

Fig. 30 is a view in vertical longitudinal section of the construction shown in Fig. 29 and taken on the line 30-30 of said Fig. 29;

Fig. 31 is an enlarged detailed view in front elevation of one of the blowing air control valves shown in Fig. 28;

Fig. 32 is a view in transverse vertical section of the construction shown in Fig. 29 and taken on the line 32-32 of said Fig. 29;

Fig. 33 is an enlarged view principally in front elevation and partly in vertical section of one of a number of cooling air distributing units for the blow molds on the blow mold table;

Fig. 34 is an enlarged view in top plan of a fragmentary portion of the construction shown in Figs. 1 and 2, and illustrating the mechanism for adjusting the neck mold operating cam;

Fig. 35 is a view in side elevation of the structure shown in Fig. 34; and

Fig. 36 is a diagrammatic view depicting the distribution of .air pressure to the various blow heads, air cushions and air motors of the lmachine.

General description In general, apparatus embodying the invention may comprise a pair of horizontal mold tables mounted for rotation about spaced vertical columns, one of said tables having a plurality of parison forming units mounted thereon, and the other of the tables carrying an equal number of blow mold units. The parison forming units are generally designated at P, Figs. 1 and 2, and the finishing mold units are generally designated at B.

The mold tables preferably are driven in opposite directions by suitable driving means so that companion pairs of parison forming and blowing units are successively moved together in the same general direction through a transfer zone between the axes of the mold tables.

The parison forming units P may be substantially identical in construction as may also the blow mold units, and although the construction shown in the drawings comprises eight parison forming units and alike number of blow mold units, any other desired number of such units may be employed.

Each parison forming or parison vmold unit P comprises a sectional neck mold, a sectional body mold, and a neck pin arranged to be projected i inwardly of the neck mold to form an initial blowing cavity in a charge for a parison, and to be afterwards withdrawn.

Each parison forming unit is preferably mounted on the parison mold table for inversion and reversion in a vertical radial plane, and cam controlled mechanism may be provided for inverting the unit inwardly of the mold table for the supply of a charge of glass thereto, and for the settle blowing of the charge. Said mechanism may be arranged to revert the unit outwardly of the table for the counterblowing of the charge into a parison in neck-up position and for the transfer of the parison in the same position to a companion blow mold unit, and it may be capable of adjustment to change the times of inversion and reversion.

Apparatus embodying the invention may comprise means for positively holding the units in reverted vertical position during successive transfer operations, and for relieving strain on the cam controlled mechanism which inverts and reverts the units which strain may be caused by the operation of the parison body molds of the units.

A suitable feeder may be provided for the supply of charges of glass to the units P, and a single guide designated generally at F, may be employed for successively directing the charges from the feeder to said units. The guide may have mechanism associated therewith for swinging it with accelerated movement from a position of rest beneath the feeder where a charge passes into the guide', forwardly in an arcuate path overlying the path of the inverted units a sufficient distance to cause the guide to travel in vertical alignment with a unit, as the charge slides through the guide into the molds of the unit, and backwardly .to the position of rest. In this manner the guide serves successive units.

Means may be provided for selectively directing charges of glass to selected units by means of the guide and its operating mechanism, and to this end, a cullet chute may be connected to the .guide F for receiving the charges which otherwise would be delivered lto the unselected units.

I The neck molds of the units P may be opened and closed by cam controlled mechanism which preferably is adjustable.

The body molds may be opened by cam controlled mechanism, and closed by pneumatic means which supplies the necessary power but which operates under the control of the cam means. The pneumatic means may hold the body molds closed during and after the inversion of the units and also after reversion while the charges are counterblown into parisons. The pneumatic means may also be so constructed and operated as to permit the body molds to be partially opened or cracked upon completion of the parisons, for the reheating thereof while enclosed by the molds.

The neck pin operating mechanism of each unit P may be arranged to beactuated in response to the inversion of the unit to project the neck pin inwardly of the neck mold, and in response to the reversion of the unit to withdraw the neck pin. Therefore, the time of operation of the neck pin is changed when the invert mechanism is adjusted.

A single settle blow head designated generally at S, may successively serve settle blowing air to the units P, the operating mechanism therefor being arranged to cause it to travel successively with the units.

The apparatus of the invention may include means for counterbalancing the force of the settle blow head mechanism on the units and on the inverting mechanism therefor, and to hold the neck pin seated in opposition to the force o the settleblowing air.

The units may have valves associated therewith for controlling the supply of counterblowing air and counterblow baille plates for supporting the charges during the counterblowing thereof.

The baffle plates which are designated generally at C, may each be raised into and held in operative position by pneumatic power means, operating under the control of cam means which determines the time of such operation, and which also effects the movement of each baille plate to inoperative position.

Each blow mold unit B includes a sectional blow mold and a blow head. Said unit is mounted for radial movement on its table. Radial movement of a unit B may be effected by a cam to cause the engagement and disengagement of a blow head and the blow mold of the unit, and to move the blow mold in a path concentric with the axis of the parison mold table while the mold is closing about a parison suspended from the neck mold of the companion unit P in effecting the transfer of the parison from a unit P to its companion unit B,

The neck mold may be opened by its cam after the blow mold has closed in effecting the transfer although the neck mold cam and the blow mold closing means preferably are arranged for adjustment.

Each blow mold unit B preferably embodies means for preventing passage of air to its associated blow head when the mold is held open, as by glass caught between the mold sections. The mold operating means also may include special means to hold the mold closed in opposition to the pressure of the blowing air on the interior thereof.

General construction and driving mechanism All of the various parts of the machine are mounted upon a base 40, Figs. 1 to 4, which may consist of a unitary casting of elongate shape and having wheels 41 mounted on the sides near one end thereof running on side rails 42 and a third wheel 43, Figs. 27 and 28, suitably mounted near the center of the other end of the base, and riding on a center rail 44. This arrangement permits the machine to be bodily moved into and out of position beneath a glass feeder 45 (Fig. 1) of suitable known construction and serving to supply charges of glass to the units P of the machine.

A pair of pedestals 46 and 47, Figs. 1, 3, 4, 27 and 28, are bolted to the base 40, the pedestal 46 having a bearing surface upon which the parison mold table 48 rotates, and the pedestal 47 having a similar bearing surface upon which rests the blow mold table 49.

rlhe parison mold table is centered about a column 51 in pedestal 46, Figs. 3 and 4, and roller bearings 52 are interposed betweenthe column and the hub of the table to reduce frictional resistance to the rotation of the table. The pedestal 46 may have a raceway formed therein, Fig. 3, in which ball bearings 53 are located which carry a ring 54, said ring in turn supporting the weight of the parison mold table.

Similarly, the pedestal 47 has a column 55 mounted therein, Figs. 1 2, 27 and 28, for centering the blow mold table 49, roller bearings 56 being interposed between the column and the hub of the blow mold table.

Formed on the edges of the parison mold and blow mold tables 48 and 49 respectively, are the gears 57 and 58 meshing with each other on the line of centers of the tables. The construction and arrangement of the table gears is best shown in Figs. 1 and 2. They provide means for continuously rotating the mold tables in synchronism with each other and in opposite directions, the parison mold table being rotated in a counterclockwise direction and the blow mold table being rotated in a clockwise direction, as indicated by the arrows Fig. 2. If desired, the directions of rotation of the mold tables may be reversed.

Considering now the driving means, and referring particularly to Figs. l, 2, 5 and 6, it will be seen that the blow mold table serves to rotate the parison mold table, and that the blow mold table in turn is driven by a pinion 59 in mesh with gear 58 and loosely mounted on a vertical shaft 6l.

Means preferably are provided for connecting and disconnecting the pinion and the vertical drive shaft 61 to start or stop the rotation of the mold tables. Said means will presently be described.

The vertical shaft 61 may be driven from a prime mover (not shown) connected to the gear 62 on the driving shaft of a variable speed reduction mechanism 63, the driven shaft 64 of which is connected through a load release device 65 (Fig. 2) of suitable known construction to the horizontal worm shaft 66, Figs. 5 and 6. Said worm shaft 66 has a worm 67 thereon in mesh with worm gear 68, keyed to the vertical drive shaft 61, previously mentioned. Thus it will be seen that when the pinion 59 is connected to the vertical shaft 6l, the pinion will be driven from the variable speed device 63, by means of which the desired speed of rotation of the mold tables may be obtained.

The pinion 59 is connected to, and disconnected from, the shaft 61 by means of a bell crank 70 pivoted at 71 in a slot formed in the upper end of shaft 61. The laterally extending arm of the bell crank 70 is so arranged that pivotal movement thereof about its fulcrum serves to move the arm into and out of the space between a pair of lugs 72 secured to the top of the pinion 59, Figs. 2 and 5. Such movement of the bell crank device 70 is effected manually by means of a cam 73 pivoted at 74 and having an operating handle 75, whereby the cani is swung into and out of position for engagement with the outer end of the laterally extending arm of the bell crank device to raise it out of the space between the lugs or to permit it to drop into said space. The bell crank 70 is held in its elevated position by means of a detent 76, Fig. 5.

Inadvertent operation of cam 73 to start the machine when the air supply thereto is olf, is prevented by a pneumatic stop 77, which engages a pin on handle 75 when the air is off, but is retracted to non-stop position when the air is on.

The mechanism for driving the mold tables also preferably is employed for driving the feeder designated generally at 45, and to this end, Worm shaft 66 is connected by a universal joint 78, Fig. 6, to a shaft 79 extending along one side of the base of the machine and slightly inclined downwardly to where it is connected through suitable gearing, not shown, to an upwardly extending shaft, a part of which is shown at 80, Fig. l. Shaft 80 in turn is connected by means not shown to synchronizing mechanism designated generally at 8l, associated with and operating the feeder 45.

From the foregoing it will be seen that the mechanism which serves to drive the table may be operated to drive both the mold tables and the feeder, or for driving the feeder alone when the pinion 59 is disconnected from the shaft 6l, as previously explained.

lThe driving mechanism also preferably includes means for manual operation of the machine and for setting the mold tables in motion to relieve the starting torque on the prime mover, said means comprising a bevel gear 83, Fig. 6, secured to the worm shaft 66, said bevel gear being engaged by a bevel pinion 84 on crank shaft 65 which may be manually rotated by means of the crank 86, Figs. l, 2 and 6, detachably connected thereto.

terasse The funnel feed FY and cullet chute associated therewith We now come to consider the mechanism for directing mold charges from the feeder 45 into the inverted parison forming units during the continuous travel thereof or for positioning a cullet chute in the vertical path of the charges in lieu of the funnel, when it is desired to interrupt the feeding of the charges to one or more of the parison mold units without stopping the feeder. Such mechanism is shown in Figs. 1, 2 and 7 to 11 inclusive, which now will be referred to, reference also being made incidentally to Fig. 4. v

As shown in Figs. 1, 2 and 7, a funnel or guide 88 which is cut away on one side as shown at 89, is bolted to cullet chute 90 which, in turn, is secured to a horizontal arm 91 by means of a pivot bolt 92, Fig. 1, and a set bolt or screw 93. By reference to Figs. 1, 2 and 7, it will be seen that guide 88 is substantially U-shaped in crosssection for its entire length and of substantially uniform cross-section. The cross-sectional area of the guidealso is relatively small, not differing greatly from that of the mold cavity as shown in Figs. 1 and 2. Consequently, the charge for the mold unit fits sufficiently snugly in the channel of the guide to be held in vertical position thereby, as hereinafter explained more fully. The guide is cut away to permit it to be moved into its position of rest without striking the bottom of a charge being formed by the feeder, if the charge should extend below the top of the guide. Cullet chute 90 is arranged to discharge glass into a stationary chute 90a, Fig. 1, which may lead to a cullet bin, not shown. By loosening the bolt 93, the cullet chute, and hence the funnel, may be adjusted through a vertical radial plane to align the funnel with the molds of the parison forming units, such adjustment being effected by means of a horizontal screw bolt 94, Figs. 2 and 7, in the funnel guide and chute 90, and having a tapered end 95 bearing against a curved surface 96 on the end of the arm 91.

As shown in Figs. 1, 2 and 4, the arm 91 is mounted for oscillation on the top of the column 51 of the parison mold table. Said arm is so shaped as to support the funnel and cullet chute rearwardly thereof (Fig. 2) to provide clearance for the settle blow head mechanism S.

The arm 91 has mechanism connected thereto for oscillating the funnel or guide from a stationary charge receiving position beneath the feeder and in vertical alignment with the discharge orifice thereof, in an arcuate path above the path of travel of the several parison forming units successively in vertical coincidence therewith and for a sufiicient distance to direct charges of glass into the molds of the moving units without distorting the charges. The charges are kept in the guide as a result of the accelerated movement thereof and by their own inertia. Said mechanism also is adapted to prevent alignment of the funnel with the feeder so that the charges of glass will be directed into the cullet chute and the operation of the feeder may be continued when the operation of shaping of charges in one or more parison forming units is discontinued.

Said arm oscillating mechanism includes a crank 98, Figs. 2 and 7, formed preferably integrally with and extending rearwardly of, the arm 91, and 4connected by an adjustable link 99, Figs. 1, 2 and 7, to the inner arm of a horizontally positioned bell crank lever 100, Figs. 1, 2, 7 and 8. Saidlever 100 is fulcrumed on a depending pivot stud 101, Figs. 2, 7 and 8 mounted in an arm 102 extending laterally of the top of framework 103. Framework' 103 is positioned between but to the rear of the mold tables as is clearly shown in Figs. 1 and 2.

Bell crank lever 100 in turn has an arm 105, Figs. 2, 7 and 8, pivotally mounted thereon and adjustable relative thereto, such adjustment being effected by a thumbl screw 106. Arm 105 carries a cam roller 107 which rides on the edge of a. cam 108, Figs. l, 2, 7, 8 and 9 on vertical cam shaft 109, journaled in framework 103. Arm 105 is adjusted to vary the initial position of the guide for the delivery of charges of different thickness.

Cam roller `107 yieldingly is held in engagement with cam 108 by means of an air spring 110 connected to arm 91, and receiving air from a supply conduit 111, Figs. 1, 2 and 36, which in turnV is connected by conduit 112 to high pressure air supply lirle 113.

The vertical cam shaft 109 is mounted near its upper end in the horizontal top portion of framework 103 and journaled at its lower end in a laterally extending bracket 114 secured to the framework 103 as shown in Figs. 8 and 9. The cam shaft 109 is continuously driven to continuously drive the cam 108 and also a cam 115 which controls the settle blow head mechanism S as hereinafter stated. Said shaft 109 is so driven by means of a spur gear 116, Figs. 7 and 9, mounted on a vertical shaft 117 journaled in framework 103, and meshing with gear 57 on the parison mold table as shown in Fig. 7. Gear 116 also meshes with a gear 118 on the bottom of shaft 109, as indicated in Fig. 9 and as shown in Fig. 7. Thus the parison forming table serves to drive the funnel and settle blow head oscillating mechanisms, thereby providing synchronism between the operation of the mechanisms and the rotation of the units P.

As previously stated, the guide F is first caused to dwell in a position of rest beneath and in alignment with the feeder until a charge passes into the guide. Because of such alignment and the uniform and relatively small cross-sectional area of the guide channel, the charge initially slides into the channel incontact with the back wall and side walls thereof which retain the charge in vertical position. This avoids impact 0f the guide with the charge when the guide is moved as explained below.

The guide with the charge therein is now moved forwardly with an accelerated bodily movement, as 'briefly explained hereinbefore. Such accelerated movement is necessary to bring the guide and thel charge up to the speed of, and into vertical alignment with, the mold unit which is to receive the charge. The guide is now caused to travel with the receiving unit in vertical alignment therewith until after the charge slides into the mold cavity. The movements of the guide assist in maintaining the charge in vertical position in the guide because the inertia of the charge urges the charge into sliding contact with the back wall portion of 4the guide channel. This tends to insure accurate central delivery of the charge to the mold cavity and avoids impact of the charge with either or both sides of the mold cavity which would result in chill spots on the charge and waviness in the finished glassware. 

